Bump version to v10.2

README.md

@@ -62,15 +62,17 @@ Example:
 //!load ...
 //!steps 5
 
-uniform int STEP; // this is mandatory!
+uniform int STEP;
+uniform int STEPS;
 
 void fragment() {
   if (STEP == 0) {
 	  ...
   } else if (STEP == 1) {
 	  ...
+  } else if (STEP == STEPS-1) {
+    ...
   }
-  // ... and so on
 }
 ```
 

examples/multistep_pixelsort.gdshader

@@ -0,0 +1,20 @@
+shader_type canvas_item;
+
+#include "./shaderlib/pixelsort.gdshaderinc"
+
+//!steps 1500
+uniform int STEP;
+
+//!load ./images/mountain.jpg
+
+void fragment() {
+	// pixel sorting works in multiple steps
+	COLOR = pixelsort_step(
+		TEXTURE, UV,
+		DIRECTION_BOTTOM_TO_TOP,
+		COLOR_MODE_OKLCH,
+		{true, false, false},
+		{-INF, .007, -INF},
+		{INF, INF, INF},
+		STEP);
+}

examples/multistep_pixelsort.gdshader.uid

@@ -0,0 +1 @@
+uid://csk0fg4by651b

examples/sobel.gdshader

@@ -0,0 +1,10 @@
+shader_type canvas_item;
+
+//!load ./images/noisy.png
+
+#include "./shaderlib/sobel.gdshaderinc"
+
+void fragment() {
+	// Sobel Filter
+	COLOR = sobel(TEXTURE, UV);
+}

examples/sobel.gdshader.uid

@@ -0,0 +1 @@
+uid://h376mk1fq4ky

project.godot

@@ -11,10 +11,9 @@ config_version=5
 [application]
 
 config/name="Fragmented"
-config/version="v10.0"
+config/version="v10.2"
 run/main_scene="res://src/scenes/main.tscn"
 config/features=PackedStringArray("4.4", "Mobile")
-run/low_processor_mode=true
 config/icon="res://src/assets/icon.png"
 
 [autoload]
@@ -28,7 +27,6 @@ window/size/viewport_width=640
 window/size/viewport_height=672
 window/energy_saving/keep_screen_on=false
 window/subwindows/embed_subwindows=false
-window/vsync/vsync_mode=0
 
 [editor_plugins]
 

shaderlib/common.gdshaderinc

@@ -13,3 +13,15 @@ vec4 alpha_blend(vec4 b, vec4 a) {
 	vec3 col = ((a.rgb*a.a) + ((b.rgb*b.a) * (1.0 - a.a)) / alpha);
 	return vec4(col.r, col.g, col.b, alpha);
 }
+
+/*
+	Rotate UV
+*/
+
+vec2 rotateUV(vec2 uv, float rotation, vec2 center) {
+	float cosRot = cos(rotation);
+	float sinRot = sin(rotation);
+    return vec2(
+		cosRot * (uv.x - center.x) + sinRot * (uv.y - center.y) + center.x,
+        cosRot * (uv.y - center.y) - sinRot * (uv.x - center.x) + center.y);
+}

shaderlib/oklab.gdshaderinc

@@ -12,6 +12,8 @@
 #include "./common.gdshaderinc"
 
 vec4 rgb2oklab(vec4 c) {
+	// oklab.x and .y (a and b) should range from -0.5 to 0.5
+
 	float l = 0.4122214708f * c.r + 0.5363325363f * c.g + 0.0514459929f * c.b;
 	float m = 0.2119034982f * c.r + 0.6806995451f * c.g + 0.1073969566f * c.b;
 	float s = 0.0883024619f * c.r + 0.2817188376f * c.g + 0.6299787005f * c.b;
@@ -29,6 +31,8 @@ vec4 rgb2oklab(vec4 c) {
 }
 
 vec4 oklab2rgb(vec4 c) {
+	// oklab.x and .y (a and b) should range from -0.5 to 0.5
+
 	float l_ = c.x + 0.3963377774f * c.y + 0.2158037573f * c.z;
 	float m_ = c.x - 0.1055613458f * c.y - 0.0638541728f * c.z;
 	float s_ = c.x - 0.0894841775f * c.y - 1.2914855480f * c.z;
@@ -46,6 +50,7 @@ vec4 oklab2rgb(vec4 c) {
 }
 
 vec4 oklab2oklch(vec4 c) {
+	// oklch.z (hue) ranges from -3.6 to 3.6
 	return vec4(
 		c.x,
 		sqrt((c.y * c.y) + (c.z * c.z)),
@@ -55,6 +60,7 @@ vec4 oklab2oklch(vec4 c) {
 }
 
 vec4 oklch2oklab(vec4 c) {
+	// oklch.z (hue) ranges from -3.6 to 3.6
 	return vec4(
 		c.x,
 		c.y * cos(c.z),

shaderlib/pixelsort.gdshaderinc

@@ -0,0 +1,126 @@
+
+/*
+	Pixelsorting using odd-even sort
+
+	I roughly followed https://ciphrd.com/2020/04/08/pixel-sorting-on-shader-using-well-crafted-sorting-filters-glsl/
+	- vector fields aren't implemented, diagonal sorting is not supported!
+*/
+
+#include "./hsv.gdshaderinc"
+#include "./oklab.gdshaderinc"
+
+#define INF (1.0/0.0)
+
+#define DIRECTION_LEFT_TO_RIGHT vec2(1, 0)
+#define DIRECTION_RIGHT_TO_LEFT vec2(-1, 0)
+#define DIRECTION_TOP_TO_BOTTOM vec2(0, 1)
+#define DIRECTION_BOTTOM_TO_TOP vec2(0, -1)
+
+#define COLOR_MODE_RGB 0
+#define COLOR_MODE_OKLAB 1
+#define COLOR_MODE_OKLCH 2
+#define COLOR_MODE_HSV 3
+
+vec4 pixelsort_step(
+	sampler2D tex, vec2 uv,
+	vec2 direction, // e.g. (1, 0) for left-to-right or (0, -1) for bottom-to-top
+	                // see DIRECTION_LEFT_TO_RIGHT, etc.
+	                // note: vertical sorting doesn't work, so using e.g. (1, 1) won't work
+	int color_mode, // 0 = RGB, 1 = OKLAB, 2 = OKLCH, 3 = HSV
+	                // see COLOR_MODE_RGB, etc.
+	bool color_channel_mask[3], // which color channel(s) to take into account
+	float lower_threshold[3],   // lower threshold for pixels to be considered sorted
+	                            // when in doubt, use {-INF, -INF, -INF}
+	float upper_threshold[3],   // upper threshold; {INF, INF, INF}
+	int step_ // from STEP
+) {
+	// sanitize inputs
+	direction = clamp(direction, vec2(-1, -1), vec2(1, 1));
+	color_mode = clamp(color_mode, 0, 3);
+	// get neighbour
+	vec2 texture_size = vec2(textureSize(tex, 0));
+	vec2 a = (mod(floor(uv * texture_size), 2.0) * 2.0 - 1.0) * (mod(float(step_), 2.0) * 2.0 - 1.0);
+	vec2 neighbour_uv = uv + (direction * a / texture_size);
+	//
+	vec4 x = texture(tex, uv);
+	vec4 y = texture(tex, neighbour_uv);
+	if ( // stop at borders
+		neighbour_uv.x > 1.0 ||
+		neighbour_uv.x < 0.0 ||
+		neighbour_uv.y > 1.0 ||
+		neighbour_uv.y < 0.0
+	) {
+		return x;
+	} else {
+		// convert color if necessary
+		// get value to compare
+		float vx = 0.0;
+		float vy = 0.0;
+		vec3 color_x;
+		vec3 color_y;
+		if (color_mode == COLOR_MODE_RGB) {
+			color_x = x.rgb;
+			color_y = y.rgb;
+		} else if (color_mode == COLOR_MODE_OKLAB) {
+			color_x = rgb2oklab(x).rgb;
+			color_y = rgb2oklab(y).rgb;
+		} else if (color_mode == COLOR_MODE_OKLCH) {
+			color_x = oklab2oklch(rgb2oklab(x)).rgb;
+			color_y = oklab2oklch(rgb2oklab(y)).rgb;
+		} else if (color_mode == COLOR_MODE_HSV) {
+			color_x = rgb2hsv(x).rgb;
+			color_y = rgb2hsv(y).rgb;
+		}
+		float divisor = 0.0;
+		if (color_channel_mask[0]) {
+			vx += color_x.r;
+			vy += color_y.r;
+			divisor += 1.0;
+		}
+		if (color_channel_mask[1]) {
+			vx += color_x.g;
+			vy += color_y.g;
+			divisor += 1.0;
+		}
+		if (color_channel_mask[2]) {
+			vx += color_x.b;
+			vy += color_y.b;
+			divisor += 1.0;
+		}
+		divisor = max(divisor, 1.0);
+		vx /= divisor;
+		vy /= divisor;
+		//
+		if (
+			(a.x < .0 && abs(direction).y == .0) ||
+			(a.y < .0 && abs(direction).x == .0)
+		) {
+			if (
+				vy > vx &&
+				// threshold
+				color_x.r < upper_threshold[0] &&
+				color_x.g < upper_threshold[1] &&
+				color_x.b < upper_threshold[2] &&
+				color_x.r > lower_threshold[0] &&
+				color_x.g > lower_threshold[1] &&
+				color_x.b > lower_threshold[2]
+			) { return y; }
+			else { return x; }
+		} else if (
+			(a.x > .0 && abs(direction).y == .0) ||
+			(a.y > .0 && abs(direction).x == .0)
+		) {
+			if (
+				vx >= vy &&
+				// threshold
+				color_y.r < upper_threshold[0] &&
+				color_y.g < upper_threshold[1] &&
+				color_y.b < upper_threshold[2] &&
+				color_y.r > lower_threshold[0] &&
+				color_y.g > lower_threshold[1] &&
+				color_y.b > lower_threshold[2]
+			) { return y; }
+			else { return x; }
+		}
+	}
+}

shaderlib/pixelsort.gdshaderinc.uid

@@ -0,0 +1 @@
+uid://doefnwk3vyr0o

shaderlib/sobel.gdshaderinc

@@ -0,0 +1,50 @@
+
+/*
+	Edge Detection (Sobel Filter and Gaussian Blur) by FencerDevLog, adapted
+	original code: https://godotshaders.com/shader/edge-detection-sobel-filter-and-gaussian-blur/
+	license of the original code: CC0
+*/
+
+vec3 _convolution(sampler2D tex, vec2 uv, vec2 pixel_size) {
+	vec3 conv = vec3(0.0);
+	// Gaussian blur kernel
+	float gauss[25] = {
+		0.00390625, 0.015625, 0.0234375, 0.015625, 0.00390625,
+		0.015625, 0.0625, 0.09375, 0.0625, 0.015625,
+		0.0234375, 0.09375, 0.140625, 0.09375, 0.0234375,
+		0.015625, 0.0625, 0.09375, 0.0625, 0.015625,
+		0.00390625, 0.015625, 0.0234375, 0.015625, 0.00390625
+	};
+	for (int row = 0; row < 5; row++) {
+		for (int col = 0; col < 5; col++) {
+			conv += texture(tex, uv + vec2(float(col - 2), float(row - 2)) * pixel_size).rgb * gauss[row * 5 + col];
+		}
+	}
+	return conv;
+}
+
+vec4 sobel(sampler2D tex, vec2 uv) {
+	vec2 pixel_size = 1.0/vec2(textureSize(tex, 0));
+	vec3 pixels[9];  // Sobel kernel
+	// [0, 1, 2]
+	// [3, 4, 5]
+	// [6, 7, 8]
+	for (int row = 0; row < 3; row++) {
+		for (int col = 0; col < 3; col++) {
+			vec2 uv_ = uv + vec2(float(col - 1), float(row - 1)) * pixel_size;
+			pixels[row * 3 + col] = _convolution(tex, uv_, pixel_size);
+		}
+	}
+
+	// Sobel operator
+	vec3 gx = (
+		pixels[0] * -1.0 + pixels[3] * -2.0 + pixels[6] * -1.0
+		+ pixels[2] * 1.0 + pixels[5] * 2.0 + pixels[8] * 1.0
+	);
+	vec3 gy = (
+		pixels[0] * -1.0 + pixels[1] * -2.0 + pixels[2] * -1.0
+		+ pixels[6] * 1.0 + pixels[7] * 2.0 + pixels[8] * 1.0
+	);
+	vec3 sobel = sqrt(gx * gx + gy * gy);
+	return vec4(sobel, 1.0);
+}

shaderlib/sobel.gdshaderinc.uid

@@ -0,0 +1 @@
+uid://bqo1fpunnl05f

src/Camera.gd

@@ -18,7 +18,7 @@ func _input(event):
 
 var old_zoom = self.zoom
 
-func _process(delta: float) -> void:
+func _process(_delta: float) -> void:
 	if self.zoom != old_zoom:
 		image_viewport_display.update_zoom_texture_filter(self.zoom)
 		image_viewport_display.material.set_shader_parameter("zoom_level", self.zoom)

src/ImageCompositor.gd

@@ -37,19 +37,26 @@ func validate_shader_compilation(shader: Shader) -> bool:
 	# test if uniform list is empty -> if it is empty, the shader compilation failed
 	return len(shader.get_shader_uniform_list()) > 0
 
-func shader_has_step_uniform(shader: Shader) -> bool:
+func shader_has_uniform(shader: Shader, name: String, type: int) -> bool:
 	for u in shader.get_shader_uniform_list():
-		if u["name"] == "STEP" && u["type"] == 2:
+		if u["name"] == name && u["type"] == type:
 			return true
 	return false
 
+func set_vsync(enabled: bool):
+	if enabled:
+		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_ENABLED)
+	else:
+		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_DISABLED)
+
 func update(overwrite_image_path: String = "") -> Array: # returns error messages (strings)
 	var shader = Filesystem.shader # read from disk
 	if shader == null:
 		return ["No shader opened!"]
 	# get number of steps & check if code has STEP uniform
 	var steps: int = ShaderDirectiveParser.parse_steps_directive(shader.code)
-	var has_step_uniform: bool = shader_has_step_uniform(shader)
+	var has_step_uniform: bool = shader_has_uniform(shader, "STEP", 2)
+	var has_steps_uniform: bool = shader_has_uniform(shader, "STEPS", 2)
 	# validate shader
 	if not validate_shader_compilation(shader):
 		return ["Shader compilation failed!"]
@@ -84,6 +91,9 @@ func update(overwrite_image_path: String = "") -> Array: # returns error message
 	image_sprite.texture = Filesystem.original_image
 	image_sprite.offset = Filesystem.original_image.get_size() / 2
 	self.size = Filesystem.original_image.get_size()
+	# already show the image viewport & fit the image
+	if fit_image: camera.fit_image()
+	image_viewport_display.show()
 	# create shader material
 	var mat = ShaderMaterial.new()
 	mat.shader = shader
@@ -95,6 +105,10 @@ func update(overwrite_image_path: String = "") -> Array: # returns error message
 	# assign material
 	image_sprite.material = mat
 	# iterate n times
+	set_vsync(false) # speed up processing
+	if has_steps_uniform:
+		# set STEPS param
+		mat.set_shader_parameter("STEPS", steps)
 	for i in range(steps):
 		if has_step_uniform:
 			# set STEP param
@@ -103,9 +117,7 @@ func update(overwrite_image_path: String = "") -> Array: # returns error message
 		await RenderingServer.frame_post_draw # wait for next frame to get drawn
 		Filesystem.result = get_texture().get_image()
 		image_sprite.texture = ImageTexture.create_from_image(Filesystem.result)
+	set_vsync(true) # reenable vsync
 	image_sprite.material = null
-	if fit_image:
-		camera.fit_image()
-	image_viewport_display.show()
 	# done
 	return errors